Felix and Koie san:
Thank you very much for your suggestions and contributions.
I have something to reply you,
but, I'm curryenty on travel and far from my home base.
Please wait for my return or other guys answer.
One short answer about alarm:
How about using gemcal?
which is a GTK desktop calendar included in current MHC package.
I also posted a simple alarm client written in Ruby.
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nom